By A. S. Povarennykh
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Extra resources for Crystal Chemical Classification of Minerals
Te4+Oa! [NOa! [P04! [As04! [VO,! SbO. NbO. [Nb04! TaO. [Ta04! [ Os! [S04J [Se04J [Cr04J [Mo0 4 J [\V04J MoO. WOo UO. 65 • Square brackets enclose forms of oxygen coordination encountered as radicals in minerals. of raising the bond order and results in the attainment by each species of coordination polyhedra, which are often distorted and thus correspond to some intermediate CN. Increase in a of a cation by reduction in CN is obtained at the expense of some other cation with a lower a, which falls still further as CN increases.
K m n o Fig. 5. Atomic groups and coordination polyhedra for the rarer coordination numbers: a) and b) linear configuratio~ (eN = 2); c) trigonal pyramid (CN = 3); d) and f) planar configurations (eN = 4); e) tetragonal pyramid (eN = 4); g) and h) tetragonal pyramid and trigonal dipyramid (eN = 5); i) trigonal prism (eN = 6); j) combination of a trigonal prism with half an octahedron (eN = 7); k) disphenoid (eN = 8); 1) combination of a hexagon with a line (eN of 2 + 6); m) Thomson cube (eN = 8); n) Laves polyhedron (eN = 12); 0) hexagonal cubooctahedron (eN = 12).
It is worth considering briefly the history of the definition of a mineral, which gives a logical basis for appreciating the current definition (Povarennykh, 1964) . , the natural objects falling within its area. But "the conception of the content of mineralogy has changed out of recognition in its thousand-year history. This conception varies and deepens as time progresses" (Vernadskii, 1928) . The scope of the concept of a mineral t remained very broad for centuries, since to this class were assigned not only all bodies of inorganic nature but also all artificial products such as metals, enamels, glass, ceramics, and pigments.
Crystal Chemical Classification of Minerals by A. S. Povarennykh